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"A.D." breaks into Welby Sanitarium to kill Mona Vanderwaal. She is shocked by the identity of the anonymous figure.

Eventually, "A.D." is revealed to be Alex Drake, the twin sister of Spencer Hastings and half-sister of Charlotte Drake. It is revealed that Wren met her in a bar in England and the two of them began a relationship together. He is revealed to be the "A.D." who visited Mona, under orders from Alex, as well as the father of Emison's twins. Alex then discloses that she wanted to be Spencer with Wren but he always saw her as Alex. In order to avoid breaking up with him, Alex murders Wren and turns his ashes into an eternity stone.